【摘要】 利用扫描电镜和X射线衍射分析研究了富硼渣MgO-B2O3-SiO2-Al2O3-CaO渣系在不同冷却速率下,连续冷却和分段冷却时富硼渣中遂安石相的析出行为.试验结果表明,熔渣以不同的冷却速率由1 500℃冷却到800℃时,由于富硼炉渣中高熔点的镁橄榄石相先于遂安石相析出,对遂安石相的析出起到阻碍作用.采用分段冷却的方法,在1 500～1 200℃温度区间快速冷却,可以很好地抑制镁橄榄石相的析出,减弱镁橄榄石相对遂安石相成核与粗化的阻碍作用;1 200℃保温使得粒子之间可以充分地相互作用,有利于遂安石的成核与粗化.可见,遂安石相的析出和长大,不仅受过冷度和黏度的影响,而且受镁橄榄石结晶程度的影响.更多还原

【Abstract】 The phase separation of suanite of MgO-B2O3-SiO2-Al2O-CaO system slag at different cooling rate is studied under the condition of continuous cooling and stepped cooling respectively by using scanning electron microscopies and X-ray diffraction.The experiment results indicate that the high melting point forsterite is separated out earlier than the suanite,which prevents the nucleation and coarsening of suanite when the temperature of the slag decreases from 1 500 ℃ to 800 ℃ at different cooling rate.The stepped cooling method,with rapid cooling of 1 500～1 200 ℃,can prevent the separation of forsterite phase and reduces the inhibition effect of forsterite on the nucleation and growth of suanite.Heat is preserved at 1 200 ℃ to ensure the sufficient interaction time among the particles,which is favorable toward the nucleation and growth of suanite.So the separation and growth of suanite phase are affected not only by undercooling and viscosity but also by the crystallization of forsterite.更多还原